(line-move-1): If we did not move as far as desired, ensure that

[bpt/emacs.git] / lisp / jka-compr.el

diff --git a/lisp/jka-compr.el b/lisp/jka-compr.el
index ada7606..fe7adb9 100644 (file)
--- a/lisp/jka-compr.el
+++ b/lisp/jka-compr.el
@@ -257,16 +257,12 @@ There should be no more than seven characters after the final `/'."
         (info (jka-compr-get-compression-info visit-file))
         (magic (and info (jka-compr-info-file-magic-bytes info))))
 
-    ;; If START is nil, use the whole buffer.
-    (if (null start)
-       (setq start 1 end (1+ (buffer-size))))
-
     ;; If we uncompressed this file when visiting it,
     ;; then recompress it when writing it
     ;; even if the contents look compressed already.
     (if (and jka-compr-really-do-compress
-            (eq start 1)
-            (eq end (1+ (buffer-size))))
+             (or (null start)
+                 (= (- end start) (buffer-size))))
        (setq magic nil))
 
     (if (and info
@@ -277,9 +273,10 @@ There should be no more than seven characters after the final `/'."
                       (equal (if (stringp start)
                                  (substring start 0 (min (length start)
                                                          (length magic)))
-                               (buffer-substring start
-                                                 (min end
-                                                      (+ start (length magic)))))
+                                (let* ((from (or start (point-min)))
+                                       (to (min (or end (point-max))
+                                                (+ from (length magic)))))
+                                  (buffer-substring from to)))
                              magic))))
        (let ((can-append (jka-compr-info-can-append info))
              (compress-program (jka-compr-info-compress-program info))